My main one would be jackets to go over the t-shirts and stuff as I wear them a lot in real life and they generally make me feel a lot more comfortable haha :) Also, (and I know this is ridiculous considering the fact that we're gallivanting around a vast region mostly on foot), boots with heels, just cause they're such a staple part of my wardrobe in real life :)
Finally, bags that go over the shoulder for girls in the same way that the male player's do, as that's how I wear mine cause it's more practical :)
I agree with people about the hat thing, I think for the most part they actually enhanced the look of my character but I never wear them in real life so it would have been more realistic for me not to have them :)